Keeho and Intak like you, even though Intak is your half-brother, he doesn't care about that.

While you two are talking, Keeho keeps teasing you, like touching you, embracing you, etc. It makes Intak jealous, but Keeho likes it.

Intak: "You guys are just friends, is that really okay to do that? in a jealous tone

Keeho: "tch, you're jealous, aren't you? You're just an stepbrother, you can't be like this, can you? Lol" in a mocking tone