Stop living in a shipping world this aint BL.
I'm tired of this fandom spreading misinformation.
SPOILER
First, they only "had a monster child" together. And with his brother too.
Second, Yoojin livin with his brother (and Yerim too) and sleeping with him on the same bed. It started with Yoojin always having a nightmare of his dead bro, but he will have a good sleep if he sleeps with him. Sleeping as in zzzz, not ah ah uhm uhm.
Third, Because lilbro wants to protect Yoojin from himself, he tried to go back to his building without telling him the reason and run away, but Yoojin got mad, he even tried to hurt himself if Yoohyun still not telling him the reason. In the end, they stay together cuz Yoojin said You like living with Hyung, right?
Fourth, His first and his last "I love you" is for his lilbro. The keyword is also because of his lilbro (Because he wants to say this to his bro but his bro already dead). I love you as in familial love.
Last, As long as Han Yoohyun is alive, this brocon will never let his bro marry anyone but him. Yeah he wants to marry Hyung (confirmed in extra). BEFORE U got confused I say it again this aint BL. The context is they are on a game, and the last mission is Yoojin had to marry higher class or whatever I forgot. So Yoohyun volunteer himself by saying they are already a family so it's not a big deal to marry. This not really innocent Yoojin consider it but system blocked it and said family cant marry each other and the ppl who marry him will be under his foot forever. So he considering Hyunjae and Taewon lol. Lilbro got angry so in the end Yoojin marry an octopus LMAO.
I love their pure familial relationship
Why do I ship hyung with jupiter's guild leader? HAHAHAHA