Jongin and Momo have been friends for a long time. When Momo left without saying goodbye, Jongin is devastated. Now that they are both Idols, It's not easy to be "best friends" again. 

There's no such things as number of heartbeats. As long as your heart knows what forever means.     

“It’s been 5 years now, oppa. Are you doing Okay? I can see your star shining brightly even at my place. I miss you, oppa. I really do.”