It's a shoujo. The femprota spend 50 chapters acquiring the male lead's heart, and when she succeeds, the rival use magic to alter his mind and make him forget about her and love the rival.
ahahah
chap12 on the manga, she wanted to punch his sleeping face but it was wrecked by the chocolate that she hid in her hand sleeve... and she revise the plan from punching to singing a lullaby.
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