Do Kyungsoo and Kim Jongin have been friends since the two could remember. Jongin was always there to defend Kyungsoo if he was picked on and Kyungsoo was there to sneak extra food into Jongin's lunch box when his mum wasn't looking. The two were inseparable  and made promises to remain friends forever, no matter what. 

And now? They're still friends but Kyungsoo see's less of Jongin ever since he got a girlfriend. What else could possibly happen? Well Kyungsoo is finding himself falling for Jongin... but Jongin is straight and would never fall for Kyungsoo... would he?