Night of the Undead

So-hee enjoys her honeymoon with her too-perfect-for-real husband, Man-gil. After looking into his phone, So-hee suspects Man-gil's affair and asks Mr. Jang from Mystery Research Lab to surveil him for 24 hours. The result is shocking: Man-gil might be an alien. For 21 hours, he kept moving, exercising or meeting women, and he gulped oils at the gas station. When So-hee finds out Man-gil intends to kill her, she again asks Mr. Jang's help to get rid of him. But things go south, and So-hee can't help but choose to work with her two high school classmates, Se-ra and Yang-sun.