The title song of this album, 'What should we do? (Shall we? ) is a retro pop song by Kenzie, which unravels the candid mind of a man who does not want to break up with his opponent late at night with analog sensibility, and Chen's trendy vocals are more attractive to the song.
About Chen
Kim Jong-dae, better known by his stage name, Chen, is a South Korean singer and songwriter. He debuted in 2012 as a member of the South Korean-Chinese boy band Exo and its subgroup Exo-M, and has since further participated in SM Entertainment's projects Exo-CBX and SM the Ballad.
 Wikipedia