Forgotten Title BL novel

I forgot the title... Its Quick Transmigration BL Novel.

The thing I remember was part of the arc when MC is ML's fiance/wife but ML is reborn so He give MC like bracelet or something(?) That MC will die slowly. But ML regret it, hes looking for the key to unlock the bracelet(?) but there is no key to begin with. MC die. Then continue to the next arc.

 

It's Arc 2 from The Strategy of Washing Clean a Slag Shou.

 

Thank you~ ^^