After 21 Days

"My fiance is the best Neuro Healer among the werewolves. His first love is his little stepsister, who once took a fatal silver arrow for him. Now, her old condition has flared up, and she has a fatal silver venom disease. She only has 21 days left to live.In order to stay with her in her final days, he pours his newly developed "Memory Lock Potion" into me to eliminate all my memories of him by force.He says, "It's just 21 days. Once she's gone, I'll feed you the antidote myself, and you'll remember me again."In those 21 days, he holds a grand bonding ceremony for his stepsister, dances with her during the Moon Goddess Festival, and makes an oath swearing that they will become mates again in their next life. Finally, he sends her off. After 21 days, the potion wears off, and he kneels in the rain with tears and blood all over his face. He asks hoarsely in an accusing tone, "The potion only lasts for 21 days… why have you forgotten me completely?"I just look up impassively at him. "Sorry, but who are you?""