At Night, My Mad Brother Uses Me as His Chessboard

[Both leads are each other's first and only, an unhinged, obsessive male lead, a sweet and obedient doll-like heroine, and love by force] Zhuang Zhou's illness is severe. He has hated chess since childhood, yet has had no choice but to play it. His upbringing has left half a gentleman and half a madman living in his soul. Shi Zi's mother was his coach, and she used every means at her disposal to train him into a formidable champion. But he was absent from the most important match. Even after becoming CEO, he still couldn't shake the muscle memory, and from then on, he became even more unhinged. Shi Zi's arrival may be either good fortune or misfortune for him. He used to be unable to sleep if he went a day without playing chess. Now, if he goes a day without seeing her, he can't sleep, and he'll go mad.