I recommend "Let Go Let Go," which has a beautiful emotional line.

It is a song that calmly expresses the process of accepting a breakup. The melody is gentle yet deeply resonates, and the members' vocals convey emotions delicately. As you listen, you feel a lump in your throat. The emotions intensify towards the chorus, making you even more immersed. It is a song that sounds beautiful despite being sad. It is DAY6's signature ballad that leaves a lasting impression. If you like emotional songs, I highly recommend it.