The acting in Secret Relationships is honestly next-level. All four leads are bringing their A-game, and it’s making every episode even more intense. The chemistry between them is insane, and you can just feel the tension in every scene.
Cha Jung Woo as Su Hyeon is definitely a standout—dude was born to play an unhinged, obsessive character. The way he balances desperation, possessiveness, and regret is just chef’s kiss. His breakdowns? Chilling. But at the same time, you can’t fully hate him because his pain feels so real.
Kim Ho Young as Jae Min is terrifying in the best way. His manipulations feel way too realistic, and the actor nails that cold, calculating vibe. He’s not just some cartoonish villain—he’s genuinely unsettling because we all know people like him exist.
Seong Hyeon is the calm in the storm, and I love that he isn’t written as just a boring “good guy.” He has depth, and you can see his frustration with Da On, but also how much he truly cares. His actor Cha Sun Hyung as brings such a quiet strength to the role, and it works so well.
And Da On? Poor guy is a mess, but that’s what makes him so compelling. You can feel his internal struggle, his confusion, his fear. Some people say he’s frustrating because he won’t stand up for himself, but honestly? That just makes him feel more real. The actor Kim Jun Seo does an amazing job at showing all that pain, even in the smallest expressions.