Unforgettable (2016)

In 2014, a radio DJ gets a letter from his first love that brings up almost-forgotten memories of the past. 23 years ago in 1991, five friends spend the summer together. One of them, shy and innocent Beom-sil falls in love with Soo-ok. Beom-sil has a noticeable crush on Soo-ok and waits by the girl's window during the summer. Soo-ok suffers from a leg injury that renders her unable to walk properly so she is always carried by Beom-sil. The love blossoms and how he always sees her as the girl he had want to marry.