Zen (Yanin Vismitananda a.k.a. Jeeja Yanin) is an autistic teenage girl born of the affair between Masashi (the wonderfully charismatic Abe Hiroshi in a cameo), a high-ranking Japanese Yakuza member, and Zin (Ammara Siripong), a Thai call-girl. A Thai mob boss simply called "No. 8" (played with sheer nastiness by Pongpat Wachirabunjong) doesn't take kindly to the Yakuza muscling in on his turf and threatens Zin. Masashi and Zin narrowly escape but Masashi is forced to flee Thailand leaving Zin to raise their child alone.