宫 Goong Corp. has been doing a top secret project under government–sponsored of South Korean, it’s called NineOne Project. Some scientists have been selected in this project to create a new species with combining human DNA with extraterrestrial creature DNA. The project has succeeded and created a superhuman and innocent alien–hybrid boy.

Taehyung hates rain. Worst! He hates thunder even more because he scared of it. But luck not on him, he was at home, on top of that, he was alone and it's raining outside there but didn't expected the thunders is coming. So what would he do? But surely the tears already fall and he really do need someone with him. 

Jin is giving and loving with no boundaries of his kindness. Of course people like him will always get taken advantage of. Namjoon is selfish and heartless with no sense of when to stop taking things too far.  The members of BTS is there to witness the unlikely romance between these two and how hard Jin tries to make things work between the two. What will happen when Namjoon finally takes things too far