Unfamiliar Relationship

Chen Qi'an had an older sister he'd secretly loved since childhood. His sister was exceptional, and everyone often shipped her with his equally excellent older brother. Compared to his brother, he felt too inferior to express his feelings.

For various reasons, over several years, they almost became strangers. He regretted it deeply and despised his own cowardice, but didn't know how to mend things.

Unexpectedly, one day, his sister met with him and said, "Let's get married."

Dong You pointed at Chen Qi'an and said, "This is my younger brother." Her friend had known Dong You for almost eight years and had never seen this "younger brother." Moreover, she remembered Dong You was an only child. Seeing the two intimately hold hands, the friend wondered, are siblings really that close?

Then, looking at Dong You's eyes, she suddenly realized, "Oh, so it's a lover boy."

This is a 1v1 happy ending, an older woman younger man romance, with a two-year age gap. There might be a tiny bit of bittersweetness and mutual secret love, with the female lead initially unaware of her own feelings.