Wu Jiaheng and Wu Yifan are twins but  are different in personality. Jiaheng is a troublemaker teenager while Yifan is straight 'A' student who likes to spend most of his times in  library. Their relationship slowly drifted apart since they constantly having argument about Jiaheng's behavior. Jiaheng finally can't take it and moved out from their apartment and that's the last time Yifan saw his twin brother. Two years