Are we seeing the same things? He's also in love with Mujin??? Where?!? He even flinches when Mujin attempts to kiss him. Remember in chapter 11(or 12), Do Gyeom asked Seung Ah if he was going to turn her down. What did Seung ah do? Initiated the first kiss between them. Do you see that happening between Mujin and Seung Ah? The kiss happened between them because Mujin took advantage of Seung Ah's vulnerability.