XinEr is the fiancée of one of the most dangerous billionaires in Asia-Kechun, a man feared, revered, and respected. Together with three other powerful figures-Ma XiaoYu, He Jianqi, and Shen HaoNan-they control a shadow empire of clubs, black-market dealings, and weapons. But when XinEr reunites with her long-lost childhood friend, Yanxin, their world begins to unravel.
Yanxin once disappeared without a trace. Now, ten years later, she's found again-but not as the same girl. She's battered, brutalized, and clinging to life after being dumped outside Kechun's club with a blood-soaked warning clenched in her hand. As secrets resurface and buried pasts clash with the violent present, the five vow to protect her.
But Lukas Qin-the man who claims to own Yanxin-has other plans.
Three friends are thrown into the unknown universe, where every game is a gamble between death-and-life. Takanashi Isuzu, Akane Chinatsu, Tsujimato Akito, carry secrets from the real world- and somehow, ties to the very people who are determine their survival.
In world ruled by games and cards.
Heart is the most dangerous suit of all.