Soobin, a freshman in university, receives letters from someone aliased 'Yeonttomeok'. It surprises him that someone, at this time, would write these letters to him. However, despite the many questions he had and the surprising letters that he is receiving, there is this one question that continues to bother him immensely. Who is Yeonttomeok? 'Letters to Crush' Sequel

In his Senior Year, Yeonjun receives letters from a person aliased 'Secret Admirer'. Curiosity fills him, wondering who this person could be and for sure, he wanted to meet him in person. At least before he graduates and moves on to college.