I'd recommend 'Dark Spell'. It shares the theme of magic and supernatural beings, similar to what you find in Succubus System. The character development and story progression are also engaging.
One similar manhwa could be 'Demon King's Bride'. It has elements of fantasy and supernatural like Succubus System.
Chapter 333, "The Clothing Design Room", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. The chapter turns that into something concrete by moving from [LOL, the little brother turns out to be socially anxious too, he...
Chapter 501, "This Night, Destined to be Turbulent", is the clearest early answer because it turns Dragon Ridge Island's situation into a concrete plot event. The chapter turns that into something concrete by moving from After settling in, Jiang Mingyu aimlessly strolled the streets.
Chapter 431, "Su Yinwan Is Here Too?!", is the clearest early answer because it turns Wilderness Survival's situation into a concrete plot event. The chapter gives readers a real answer by opening on [Holy shit, why is Su Yinwan on this show too???] [!!!
Chapter 605, "The Plan to Surround and Annihilate Team Q Commences!", is the clearest early answer because it turns Shang Shaojing's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The thirty-odd people lurking by the shore were just like today's...
Chapter 613, "When a Whale Falls, All Life Thrives", is the clearest early answer because it turns Xingmei Entertainment's situation into a concrete plot event. The chapter gives readers a real answer by opening on Hearing He Wen's words, Shen Lan was so excited she nearly sprayed...
Chapter 690, "Miss Jiang, Marry Me!", is the clearest early answer because it turns Wen Jiaojiao's situation into a concrete plot event. The chapter gives readers a real answer by opening on No wonder she had predicted she would come into some unexpected...
Chapter 663, "How Did These Two Start Fighting?!", is the clearest early answer because the buildup finally cashes out in a real clash. A useful checkpoint is the way the scene starts with Jiang Shixu received the message in daylight the next day.
Chapter 459, "Even Got Educated by a Variety Show", is the clearest early answer because it turns Zhuola's situation into a concrete plot event. The chapter gives readers a real answer by opening on Su Yinwan felt somewhat annoyed but could only suppress the emotion...
Chapter 328, "Persuading the Old Master", is the clearest early answer because it turns Qiao Shuang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Jiang Li's authoritative words stunned the old man.
Chapter 426, "How Did Someone Fall Down?!", is the clearest early answer because it turns Do's situation into a concrete plot event. The chapter gives readers a real answer by opening on Isn't this a bit too risky..." Liu Qian, standing out of the camera's...