A breathtaking fight in the group chat room

(1)mathematical domain
(2)Make it a habit to study self-study every day
(3)Choi Soo Hyuk of Pohang Steel High School with perfect score on the CSAT
(4)Korea Institute for Curriculum Evaluation
(5)The Importance of Late Nights 1
(6)519pm
(7)I was good at studying Q
(8)Head vs effort
(9)Honestly, all the hair