In Zhu Huilin's absence, Yoon Sulhwa finally catches the eye of her beloved, Chun Jaehee. As Jaehee conceals her unconventional desires and affection, Sulhwa uncovers her secret passion for BDSM. Eager yet inexperienced, Sulhwa tentatively enters the world of BDSM to satisfy Jaehee's cravings. Meanwhile, upon Huilin's return, she realizes she no longer solely possesses Jaehee's heart. Conflicted between love and lust, Huilin seeks to unsettle Sulhwa and assert her dominance over Jaehee. Undeterred, Sulhwa immerses herself in mastering the complexities of BDSM, determined to win Jaehee's love and keep her forever.