Ling Jin's legal spouse, Bai Chizhao, was an undercover agent sent to get close to him.
When he was undercover, Bai Chizhao only knew how to hide behind Ling Jin, and missed every shot at the shooting range.
After his identity was exposed, Bai Chizhao and Ling Jin became bitter enemies. Later, when Ling Jin was ambushed by others and lost control of his mental powers, Bai Chizhao killed him before he could go completely insane.
Ling Jin jolted awake and discovered he'd transmigrated back three years.
The good news: he was back in the past and could change the future where Bai Chizhao shot him dead.
The bad news: he'd returned to the day after his and Bai Chizhao's wedding.
Ling Jin looked at the bruises on Bai Chizhao's body and remembered the last words he'd said before Ling Jin had worn him out and knocked him unconscious the night before.
"Sooner or later... I'll kill you..."
Holy crap, he really meant it!
Bai Chizhao was the Tower's most promising Guide, and had been voted the Tower's most popular Guide year after year.
And yet Bai Chizhao had taken a special interest in Ling Jin from the moment they met.
On a date.
Bai Chizhao (smiling): "It was love at first sight for me."
Ling Jin: "Sure, but do we really have to go on a date at the shooting range... and could you not stand behind me holding a gun?"
While kissing.
Ling Jin pinned Bai Chizhao against the wall, feeling his soft lips... and the arms tightening around his neck.
At first, he thought Bai Chizhao's grip felt like he was trying to strangle him to death. Now it seemed he really was trying to strangle him to death!
Later, Ling Jin died accidentally during a mission. Bai Chizhao refused to be assigned another Sentinel, until Ling Jin appeared in front of him again.
Bai Chizhao: "..."
Ling Jin: "Surprise?"
Bai Chizhao (smiling through gritted teeth): "Weren't you dead?"
Ling Jin: "I was. Why are you dressed in white?"
Bai Chizhao: "To mourn my dead husband."
Ling Jin: "..."
Bai Chizhao: "Why aren't you dead yet?"
Ling Jin: "I was afraid my wife would be lonely as a widow."
Bai Chizhao: "..."
Bai Chizhao (smiling): "I'm just a Guide. How could I possibly kill anyone?"
Ling Jin: "Yeah... right."
Powerful, scheming, expressionless top x seemingly gentle but actually unhinged bottom
Theme: Making up for regrets