Under financial pressure, Lin Xia has no choice but to rent Room 404 in an old apartment building on the outskirts of the city. The cheap apartment comes with a chilling rumor: five years ago, a woman named Lin Yue died there under mysterious circumstances. Despite the landlord's evasive answers and the neighbors' reluctance to talk, Lin Xia moves in.
On the very first night, one strange incident follows another: dripping water in the bathroom in the dead of night, a white figure flashing past in the mirror, a bloodstained ring appearing out of nowhere... As Lin Xia investigates, she discovers that behind this seemingly straightforward suicide lies a shocking secret spanning twenty years.
A yellowed diary, a bloodstained ring, an unfinished wedding, a missing twin sister... As the truth gradually comes to light, Lin Xia realizes she has already become deeply entangled in it. And the vengeful spirit in Room 404 seems determined not to spare anyone who learns the truth...
In this story full of lies and betrayal, who is the real killer? What secrets have remained hidden in the murder case from twenty years ago? As the vengeful spirit awakens and the truth is revealed, Lin Xia faces a deadly showdown...
