Myungsoo and Sungyeol grew up in a orphanage togther, but was seperated when Myungsoo got adopted by a family. Sungyeol thought he completely lost contact with Myungsoo until he met him again at a University freshman year of college, but the strange thing is its not the man he knew. The one he thought was Myungsoo goes by the name L Kim. There is just something strange about this L Kim. Sungyeol loves the loving and sweet Kim Myungsoo but he also loves cold and distant L Kim. Myungsoo and L despise other and almost doesn't acknowledge one another. They are also polar opposites in personally, however there are two things that L Kim and Kim Myungsoo share. They both are madly in love with Lee Sungyeol and they have one body.

Character: 

L-Kim : His personality is dark, aloof, and quite cold towards Sungyeol, but deep down he really adores/love him. He is also very posessive and sometimes it can be really bad. L has a scary temper. His distrust for people runs deep and only have a few friends that he deem worthy but mainly only believe in Sungyeol. L like Myungsoo is very intelligent and its hard for people to get past him. He doesn't tolerate most people. 

Kim MyungSoo: Myungsoo is a very bright person, sometimes he is very shy but most times he is quite friendly. He is not like L at all but whats similar is he adores and love Sungyeol very much. He can get really jealous when Sungyeol is around other people but he doesn't show it as bluntly as L. He is the original persona between the two. He is a little on the odd side and he's very innocent. Despite being quite naive he is very smart academically.  

Lee Sungyeol: Despite a lot of unfortunate things that happened in his past he still maintain a bright persona. He view life very positively although he gets stressed out a lot by the ones he care about mostly the things that happen with Myungsoo/L. Sungyeol loves Myungsoo and L with all his heart.