On Your Wedding Day (2018)

"The innocent and innocent love in high school went through ten years of running-in, during which the relationship kept changing, from heartbreak and disputes, to the pain of lost love, to falling in love again, and they were entangled repeatedly. This is an "innocent man" (played by Kim Young Kwang) who only looks at one woman, and a "first time man" who can't guess his inner thoughts..."