Seven-Day Echo

Precision clock restorer Chen Mo, on the seventh night after his wife's "fatal car accident," receives a bizarre birthday cake and a warning card from his deceased wife. Then, Lin Hai, who claims to be the captain of the city's criminal investigation unit, breaks in and presents irrefutable evidence that overturns Chen Mo's understanding—a lab surveillance video shows that the person who pushed Lin Wei off the 17th-floor platform last night was none other than Chen Mo himself. In the ensuing life-and-death confrontation and desperate escape, Chen Mo accidentally discovers that the blood flowing from a wound on his left hand glows with an eerie blue fluorescence, and the "old burn scar" under his left collarbone is actually a laser code for an experimental subject: [ECHO-07]. It turns out that the real Chen Mo died three years ago; he is merely the No. 7 memory-overwrite vessel cultivated by the genius scientist Lin Wei. The one who fell from the building last night was the awakened and rebellious No. 6 experimental subject, and Lin Hai is the chief cleaner sent to cover up the illegal cloning experiment. In the countdown loop to 10:10, Chen Mo uses the miniature detonator hidden by No. 6 in the interlayer of the pocket watch to turn the tables and kill the cleaner. Just as he thinks he can escape by getting the access card, a gentle and infatuated laugh from Lin Wei comes over the broadcast—and in the center of the yellow peach flesh of the collapsed birthday cake on the living room dining table lies quietly half a severed finger wearing a platinum wedding ring... — Description from novelcodex.orgFull novel: Seven-Day Echo — read the rest free on N​o⁠v​e⁠l​C⁠o​d⁠e​x⁠.​o⁠r​g⁠