Yeah, you're reading it pretty much how it's intended. Jiheon's made his choice to basically "sell his body" in exchange of Jaekyoung going to the olympics. You could honestly read this as coercive in some way, it's not wrong. This story is very very long, but you've got to take into account this more of a transactional act rather than an actual act of love, and that's something we're probably only going to get a long while from now.

48 grueling chapters in….here we are…was it worth it for some? Maybe. For me? No. The sex scene is drawn so stiff, and I still don’t feel any attachment to either of the MC’s. Even not that they’re having sex It STILL doesn’t feel like Jiheon actually really is romantically interested in Jaekyoung, and it feels like it’s just Jaekyoung one sidedly forcing Jiheon into a situation where they have sex so Jiheon doesn’t feel guilty. The feelings seem so one sided that it feels mildly coerced, or at the very least manipulative.