Vaguely Remember

A young love leads to a lifetime of love and affection. In college, Ida was innocent and fell in love at first sight with Sili, the lead singer of the campus club band. However, just as the two fell deeply in love, why did Ida suddenly leave without any news? What was the purpose of appearing in front of Xili when he came back five years later? And what kind of revenge will the devil Sili, who has done whatever it takes to achieve fame and wealth and even gave up his original dream, take on her? Just when all the misunderstandings were resolved, why did Ida stay away again? Who is Ida, and who is Siri?