Korejski misteriozni krimi triler redateljice Eun-jin Pang koja je 2005. debitirala sa solidnim filmom osvete Princess Aurora. Suspect X pak nema veze sa osvetom koliko sa misterijom, prijevarom i ubojstvom. Film naime govori o profesoru i matematičkom geniju koji je potajno zaljubljen u svoju susjedu. Kada jedan dana u žaru svađe ona ubije svoj bivšeg muža, profesor joj odluči pomoći i zataškati ubojstvo. Ali detektiv na slučaju ipak odluči slijediti svoj instinkt, te mu susjeda, ali i profesor bivaju sve sumnjiviji. Postavlja se pitanje, tko je Suspect X!? Korejska premijera filma je zakazana za 18. listopada 2012.
Suk-go showed a lot of promise as a brilliant mathematician when he was in school, resolutely focused on his studies rather than on friends throughout his childhood. Now in his 30s he’s an ordinary high school math teacher, a far cry from the promising future of his youth. His morning exchanges with Hwa-sun, the shopkeeper he buys lunch from, is the brightest part of his day. During a violent altercation with her ex-husband where he mercilessly beats both her and her niece, Hwa-sun kills him. Suk-go overhears the fight from his house next door and decides to cover up the killing and protect her from the police. He plans the perfect alibi for her and thanks to his efforts Hwa-sun is never much of a suspect in the case. However, the detective in charge, Min-bum, believes that Hwa-sun is indeed the killer and follows his instincts. He also finds out that the man next door graduated from the same high school as his suspect and starts digging deeper into his life…