Jake's growth record from his own compositions to live performances

As soon as Jake's voice came out of the limousine service

Vocals layered over a single piano without any fancy devices can be this full.
When singing Sleep Tight, it is good to put your heart into every single lyric.
I also like the comment that it is a song made with the engine in mind.
I felt that the expression "boyish charm" mentioned by Lee Mu-jin fit the stage perfectly.