Ouyang Guang suddenly realized that the heavy weight on his heart for the past three months had disappeared. He quietly rolled down the car window, letting the cool breeze from Seoul blow away the heat in his eyes.

After returning to the dormitory building, the three of them went straight to Zhang Yixing's original room. When they opened the door, a faint musty smell hit them. The furnishings in the room were still the same as when they left, and a thin layer of dust fell on the photo wall at the head of the bed.

"Do we have to move all these things over there?" Kim Seung-hyun pointed to a pile of notebooks and CDs in the corner.

Zhang Yixing nodded and carefully took down the handmade star map hanging on the bedside: "You must bring this. Xiaoguang and I made it together."

Ouyang Guang was bending over to tidy up the closet, and paused when he heard this.

After watching f(x)'s debut performance, they stayed up all night watching an astronomy documentary and drew the Big Dipper on black cardboard with fluorescent paint.

He told Yixing about the Starry Sky Park on Jeju Island, and he still remembered that Yixing said, "When we get out, let's go to the Starry Sky Park on Jeju Island to see the real stars together."

The most difficult thing was the electronic keyboard. It took three people to carry it downstairs. Kim Seung-hyun almost fell down at the corner of the stairs, which attracted the dormitory manager's roar. By the time they moved everything to the dormitory, it was already dark.

"I'm starving!" Kim Seung-hyun collapsed on the ground and wailed, "Let's go eat hot pot! Celebrate Yixing's return!"

Ouyang Guang looked at Zhang Yixing, who was gently wiping the photo of three people - in the photo, they were standing at the gate of MBC, laughing heartily.

"Okay." Zhang Yixing placed the photo frame in the most conspicuous position on his desk, "I know a hot pot restaurant, the boss lady is from Sichuan."

The hot pot restaurant was steaming hot, and the red oil in the pot was bubbling. Kim Seung-hyun's face was red from the spiciness, and he guzzled ice cola; Zhang Yixing skillfully scalded Ouyangguang's tripe, timing it just right; Ouyangguang silently divided the cooked shrimp paste into three portions.

"By the way," Zhang Yixing suddenly put down his chopsticks and took out a USB flash drive from his bag, "I wrote a song in China, let me show you guys."

When the familiar melody came from the mobile phone, Ouyang Guang's hands paused while picking up the food.

It was that familiar song, the lyrics full of hope. Zhang Yixing's voice came through the noisy background: "... because I have my family behind me looking at me with approval..."

Kim Seung-hyun's eyes were already red, while Ouyang Guang lowered his head and ate his food, pretending that the heat was burning his eyes.

When I walked Kim Seung-hyun downstairs to his house, it was already late at night. The street lights stretched the shadows of the three people long and overlapping.

"See you tomorrow!" Jin Shengxian waved vigorously and walked into the apartment building, looking back every three steps. Only after his figure completely disappeared behind the door did Zhang Yixing turn to Ouyang Guang: "Let's go."

They walked slowly along the path by the Han River. The December wind was bitingly cold, but neither of them was in a hurry to go back. The lights on both sides of the river were reflected on the surface of the river, like scattered stars floating on the waves.

"I'm actually scared," Zhang Yixing said suddenly. His breath lingered briefly in the air before disappearing. "I'm afraid I'll give up my studies and come to Korea to be a trainee, but I'll never come back because of fighting."

"I'm afraid to face the concerned and worried looks of my family and friends, but I can only pretend nothing happened." Zhang Yixing's voice became lower and lower.

Ouyangguang silently untied half of the scarf and handed it to Zhang Yixing. It was a dark blue cashmere scarf, a gift given to him by Yixing before he left because he could not spend his lunar birthday with him.

"Do you remember?" Zhang Yixing took the scarf, and his fingertips accidentally brushed across the back of Ouyang Guang's hand, "We agreed to go together..."

"Brother Yixing, I have something to give you." Ouyang Guang suddenly interrupted him, reached into his coat pocket, and pulled out a small dark blue velvet box. His fingertips trembled a little, and the box almost fell to the ground.

Zhang Yixing took the box puzzled and opened it in the light of the street lamp - inside lay an exquisite silver necklace. The pendant was a hollow sun shape with a purple star in the center, glowing faintly in the night.

"This is..."

"Your birthday present." Ouyang Guang stared at the tip of his shoe. "You were still in China when you had your birthday, so I could only call to wish you a happy birthday." He paused, "This is the money I saved for three months as a trainee. I didn't use my family's money... I chose the purple diamond on purpose. Don't you like purple the most?"

Zhang Yixing's fingers gently stroked the pendant, and the purple diamond reflected a dreamy halo under the street light. He suddenly remembered that when he accompanied Ouyang Guang to buy gifts before leaving, the other party stopped in front of a jewelry store window for a long time. It turned out that at that time...

"Help me put it on?" Zhang Yixing turned around and handed the necklace back.

Ouyang Guang's hands were even more clumsy than when he practiced, and it took him several times to fasten the buckle. His breath brushed the back of Zhang Yixing's neck, causing him to tremble slightly.

Ouyang Guang's fingers gently stroked the sun pattern on the necklace, and his voice was so low that it was almost inaudible: "The sun is me, and the stars are you. Just like you always light up me..." He raised his head and looked firmly into Zhang Yixing's eyes, "Now, I can protect you too."

"Xiao Guang..." Zhang Yixing's Adam's apple moved, and the necklace suddenly became hot, and the area against his collarbone felt slightly hot.

The wind from the river suddenly became stronger, ruffling Ouyangguang's hair. He subconsciously reached out to help Zhang Yixing tighten his scarf, but his wrist was grabbed in mid-air.

There was a thin layer of calluses on the palms of Zhang Yixing's hands, left by frequent dancing practice. They were warm and dry, tightly wrapping around his slightly cool fingertips.

"You have protected me." Zhang Yixing shook the necklace, and the purple diamond shone. "If you hadn't been with me during those days, I might have really collapsed." He smiled, but his eyes gradually turned red. "For the past three months... I have been looking forward to the messages you sent me every day."

The light from the convenience store in the distance shone over, casting overlapping shadows at their feet. Ouyang Guang suddenly realized that when Yixing left, he was still one or two centimeters taller than him, but now he had to lower his head slightly to look him in the eye. This realization made his heart skip a beat.

Zhang Yixing reached out and ruffled Ouyang Guang's hair, just like he used to do before: "Xiao Guang, we are the stars that illuminate each other."

The purple diamond on the necklace sparkled in the moonlight, like a small miracle. In the distance, the ripples of the Han River and the lights of the city intertwined, but at this moment, the two young men only had each other's star-like appearance in their eyes.