Poor Yujun, he had to hide his Gay relationship and give in to blackmail, because it's considered a death sentence in South Korean schools and even in society to be gay, which would destroy his idol career, and even his lover's life would've been ruined. Which is why he said nothing to protect his lover while being beaten and did whatever that bitch wanted due to those fears of being outed.
Poor Yujun, he had to hide his Gay relationship and give in to blackmail, because it's considered a death sentence in South Korean schools and even in society to be gay, which would destroy his idol career, and even his lover's life would've been ruined. Which is why he said nothing to protect his lover while being beaten and did whatever that bitch wanted due to those fears of being outed.