Kim Hyun Joong found out who killed Choi Jae-seong.
On the fourteenth episode of the KBS 2TV drama "Generation of Youth", Sin I-chi (Jo Dong-hyeok) and Aoki (Yoon Hyeon-min) closed in on Jeong-tae (Kim Hyun Joong) by gathering in Shanghai.
Aoki ran into Jae-hwa (Kim Seong-oh) first and called him 'the leader everyone ignores'. Jae-hwa was furious but Aoki handed him a name card which said that he was the director of the intelligence bureau.
Sin I-chi was also in Shanghai. Jeong-tae asked him why he was there and he said, "There's no reason. I just need to get rid of you", then he swung his fist at Jeong-tae.
Thankfully, Jeong-tae had support. Baek San (Jeong Ho-bin) came to help but he was also a dark hearted one. He planned on raising Jeong-tae as the hawk of Hwangbang. Baek San fought with Sin I-chi instead of Jeong-tae and Jeong-tae found out that Baek San was the one who killed Yeong-chul (Choi Jae-seong).