Jinri unexpectedly finds out about Sehun and Soojung when she catches them kissing backstage. Soojung blushes a deep-shade of red and Sehun turns away, his face devoid of emotion (except the twinkle of excitement in his eyes). 

She comes to a conclusion that even though he might call Soojung a , complain about her, vow never to fall for her again,  he will always love her. 

Just like the way Jinri will always have a special place in her heart for Lee Taemin.