잘해줄 걸 (我会好好对你)这张专辑收录了由Kim Siwon创作并演唱的歌曲《잘해줄 걸》。歌曲的作词作曲均由Kim Siwon完成，编曲则由Kim Siwon、김민혁和Heedo共同完成。吉他部分由김민혁演奏，贝斯由한민규负责，鼓和和声则由Kim Siwon亲自演绎。混音和母带处理由Stally完成。这首歌曲以其深情的旋律和真挚的歌词，展现了Kim Siwon独特的音乐风格。잘해줄 걸[Credits]Lyrics by 김시원Composed by 김시원Arranged by 김시원, 김민혁, HeedoGuitar by 김민혁Bass by 한민규Drums, Chorus by 김시원Mixed & Mastered by Stally