Snow and Frost, Born Together

[One heroine, the only one + equally matched leads + transmigrate + System + both are each other's first and only + no alternate world] [No logic...] Feng Jiuhan, a second-year student at Jing University, is at a loss. He transmigrated into a book, and came with both an unreliable System and an unreliable older sister! Complete missions to go home? Easy. He'll do them. But... Feng Jiuhan doesn't know that he's lost his memories... Feng Jiuhan, currently amnesiac: “I just want to complete the missions. Losing my virginity wasn't on the list! And to a violent princess, no less! Should I make a run for it?” And after his memories return... Feng Jiuhan, memories restored: “Run. Now!” When they meet again: Xue Sixing: “I'm not letting you run away again.” Feng Jiuhan: “I'm back.” Feng Yuci: “Family should stay together. (^~^)” Shu Wanlin: “Guess how important I am to you?” Mysterious person: “Wifey~” Shu Wanlin: “Get lost!” She knows she loves her, but the other woman doesn't know she loves her. Main couple: An aloof and distant immortal lord who is actually gentle and secretly flirtatious x a mysterious princess with a split personality Side couple: A theatrical goofball on the outside, but a gentle, proud, and cold immortal lord inside x a mysterious person Mysterious person: “Do you hope I'm a man or a woman?” Two-line summary: Meeting you is my wish. Meeting you is my good fortune. Author: The first few chapters are a bit rough... Please bear with me...