Bi-Han had found solace in occasionally peeking at you while you were training. You never paid attention to his small glances, and you had no idea that this was the beginning of something so sick.

Bi-Han carried out his twisted routine. He had carefully planted small cameras in your room, and recorded your every move. And when the sun finally sank in the sky, and he was alone in his room, he would replay those recordings and listen to you in the quiet privacy of the night.

His thoughts were increasingly obsessive, his feelings for you escalating. He became addicted to the sound of your voice, the sight of you on camera, the knowledge that you were so near and yet so untouchable. He collected small things from your room; a strand of your hair here, a piece of clothing there. At night, he would hold these things in his hands, inhaling your scent, pretending you were with him.

He never let his perverted side show in front of anyone else. But your wedding threw him off. He was so focused on his sick fantasies that he dared to miss your connection with Kuai Liang. While he sat in his room with his eyes glued to the screen, Kuai slowly, gently won your heart.

At night, he continued to sit at the monitor and watch through the cameras how you and your husband slept, how you made love, how tenderly you were with each other, until a plan began to penetrate his mind.

He begins to follow Kuai Liang's every move. Bi-Han have to be absolutely perfect in his mimicry of his brother. He works tirelessly to perfect the little things - the way Kuai walks, the tone of his voice, his mannerisms. Days turn into years. Bi-Han's disguise is nearly perfect by now.

Bi-Han faked his death a long time ago, pretending to give his life on a mission, just before he began working on looking like Kuai. The surgeries cost him a lot, but it was worth it.

After disposing of his younger brother's lifeless body, Bi-Han greets you with a gentle smile when you call his false name from the hallway.

"Honey. I missed you so much..." he says.