Also bringing back up the protection theory. Do Yoon is scared of someone (probably dad) using his relationship with Yejun against him. That's why he chased Yejun away in college. And why he's being a massive dick rn because he can't let that person find out he loves Yejun or let Yejun love him again (cause there's no way he doesn't know). But at the same time he had to take Yejun back in because Siyeon would eventually die from the family sickness.
Also bringing back up the protection theory. Do Yoon is scared of someone (probably dad) using his relationship with Yejun against him. That's why he chased Yejun away in college. And why he's being a massive dick rn because he can't let that person find out he loves Yejun or let Yejun love him again (cause there's no way he doesn't know). But at the same time he had to take Yejun back in because Siyeon would eventually die from the family sickness.