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Why do people act like it's such a difficult story to understand? T_T
The father wants to leave the company to Jitae so his half brother (Jian) wants to bring him down, that is why he planted spies in Jitae's house (to find something that can be used against him).
Then here comes Mieum who goes there as a spy. But the problem is that Jitae was kidnapped when he was a kid (typic kdrama plot, rich kid gets kidnapped), and the man who kidnapped him was Mieum's father.
Jitae was in love with Mieum when they were younger and Jian knew that Jitae would recognize Mieum, that is why he sent him there. Jitae recognized Mieum as soon as he saw the scar on his neck (chapter 2) and still loves him after so many years, but Mieum does not remember. (We had flashbacks which might mean that Mieum's father wanted to kill Jitae but Mieum saved him, and that caused him the memory loss. And now Jitae is trying to help Mieum find his dad (eventhough he almost killed Jitae and Mieum), because that's what Mieum wants, and trying to help him remember.
What we don't know yet is the Hajoon-Mieum-Jitae story. But probably Mieum took Hajoon's nametag by mistake that is why he thinks Hajoon is the good person.