Run! My Yandere Junior Disciple Is Actually the Demon Lord

[Yandere + younger love interest + cultivation + only each other + immortal and demon realms + older sister and younger brother]

[Violent, yandere Demon Lord posing as an obedient junior disciple × gentle, mature, white-lotus senior sister]

Bai Yunwan was the senior sister of the immortal realm. She thought that once the demon realm had fallen, she would share a blissful life with her gentle senior brother. But halfway through raising her sweet, obedient junior disciple, his secret identity as a yandere Demon Lord was suddenly revealed. Yunwan, caught under a love spell, wakes up in her junior disciple's bed. He has since transformed, and with his usual innocent smile, he says wickedly, “Senior Sister Yunwan, you'll have to take responsibility for Ah Huai.”