Several ’99-line idols are heading on vacation together for “Battle Trip 2”! Ahead of the upcoming “school trip” special of KBS2’s “Battle Trip 2,” the program has unveiled a preview featuring Oh My Girl’s Arin, WJSN’s Dayoung, Weki Meki’s Choi Yoojung, THE BOYZ’s Ju Haknyeon, and WEi’s Kim Yo Han and Yoo Yong Ha, who