Karl has 2 Fever concerts.

1. Fever is a Thai female idol group, that started auditions for members in May 2018, finalizing with 12 members. The group debuted in late 2018 with their first single Start Again, followed by their coupling singles Ghost World and Password. Several group members were previous candidates for BNK48's 2nd Generation. The group is run by Roamrun Entertainment and consists of members Pop, Cee, Su, Froy, Beam, BeamBeam, Baimon, Ply, Spam, Baibua, Baifern, and Boss.