My Stepmother, My Love Loop

Megan Morgan, an NPC, has an accident and transforms into the newly-wed Fourth Mistress of The Marshal's Mansion. She falls into a death loop, dying tragically within three days, only to be reborn. She discovers The Young Marshal, Leo Landon, also possesses modern memories and is in the same death loop. They fight side by side against the mansion's schemes and hidden dangers, uncovering power struggles and murderous plots. Through each 'death reset,' they confirm their feelings.