u/Deep_Photograph_6218

I read this at least 2 years ago. It's already completed and I think it had 60+ chapters. The part that I remember was halfway through the story, like around chapter 30, a female friend of the MC leaves Korea to go abroad. The chapter shows her with her suitcase at the airport then the plane departing. In the final chapter, he receives a letter from her, telling him she's doing well abroad.