Jaebum is called heartless by his fans for not crying, even when GOT7 had their first win but Jinyoung knows that's not the case. He knows Jaebum is not the strong leader everyone thinks of him to be when he locks himself in the bathroom. 

Jaebum goes camping to the woods one weekend to get rid of all the pollution in his mind and body. He ends up meeting a mythical creature in the process. He doesn't know why he helped the merman explore the human world and in the process, why he fell in love.

Im Jaebum loves s but at times their presence can be a bit overwhelming for him and that is when he escapes to Jinyoung.