need help looking for the title!!!

i vaguely remember reading a smut manhwa about a girl who's caught in the emperor's schemes because she's the former crown prince's tutor's daughter and also because the emperor found out the crown prince has been pretending to ba a commoner slave and has been helping out his tutor (who was blinded by the emperor). the girl fell in love with him without knowing about his real identity but eventually she came to find out when she was kidnapped (iirc) and brought to the palace. something something happened but yea she's been staying in the crown prince's palace (which i specifically remember has no sunlight at all except this one corner in the garden). it's set in a chinese imperial era. i also remember how the emperor is actually the crown prince's uncle who assumed the title because the crown prince was not legal yet to be the emperor (or he took it i forgot) but he can't kill the crown prince yet because iirc, his image to the public is good so the passing of the crown prince might reflect heavily on him. also he and his concubine has been trying do hard to conceive him a male child so that he can pass the throne to his offspring and he can finally kill the crown prince. HAHAHAHAHA it's so frustrating remembering the story BUT the title