The Mohorovicic Discontinuity

[Marriage of convenience] [Marriage Before Love] [Multiple personalities] [He comes from beneath the earth] Snow fell softly outside the window. It was still dark when Song Changli got up and went around the foot of the bed to get his clothes. He accidentally brushed against Chi Nian's foot. He apologized at once. "I'm sorry." Chi Nian woke up and drew her legs in. "It's fine." He picked up Chi Nian's clothes and set them beside her. Chi Nian: "Thank you." Song Changli: "It was nothing." He put on his shirt and carefully fastened each button, then did up his cuff links. "I'm going on a business trip today and won't be back until Monday. Could I ask you to call the property manager about the light by the entrance?" Chi Nian: "Sure." Song Changli: "Sorry to trouble you." Chi Nian: "Don't mention it." Song Changli walked to the door. With his hand on the doorknob, he paused, then let go and came back. He knelt on one knee on the bed and leaned over Chi Nian. His breathing was uneven, but his tone remained polite. "Since I won't be back until Monday, could we skip this week and do it now in advance?" - Chi Nian met her ideal marriage partner, Song Changli, through a blind date. He was flawless in every way, and a perfect gentleman. Even after they married, they continued to live in separate bedrooms, far apart from each other. They only met at breakfast, and even then, they barely did more than exchange nods. Then, one night, someone scratched at the door to her bedroom. What kind of monster was this flawless legal spouse of hers? Marriage Before Love, happy ending, updated daily in the morning. Content warnings: 1. The characters, events, companies, and so on are not based on real people or things. 2. The male lead has multiple personalities, some of which are a little odd. The heroine has romantic storylines with different personalities. One body, one partner, and he is her only legal spouse. 3. The heroine had a boyfriend in college. The male lead has no dating history. 4. This is definitely contemporary romance, not a genre mix-up. Note: The Moho discontinuity, formally called the Mohorovicic discontinuity, is the boundary between the Earth's crust and mantle. Upcoming novel: My Little Sister Xiao Ya, call me big brother. (Confused): Ya? Call me big brother. (Testing him): Ya... Big brother. (Serious): Ya. Big brother. (Absolutely certain): Ya! After that, whenever he called her "big brother," Xiao Ya would grin and run over with her arms outstretched. Wait, which one of us is the big brother? - Xiao Ya was raised little by little by a brother several years older than her. Her brother wasn't much older himself. He taught her to talk and walk, and showed her how to find things worth money at the planet's waste-processing plant. For her birthday, he dressed her in a princess gown and made her look beautiful, then taught her how to cadge food and drink at rich people's homes. He taught her everything, in the most chaotic and haphazard way possible. She grew up in that same chaotic way until she was fourteen, when her brother suddenly disappeared. With her brother gone, Xiao Ya found herself a good, wealthy family and took good care of herself. She didn't see her brother again until several years later. He looked completely different: finely dressed, noble and cool, and astonishingly handsome. Whatever else, he was still her brother. Just like before, she leaped onto his back in a flash. This time, she would hold on tight and never get down. One-on-one romance, happy ending. The title and names are tentative. Content warnings: 1. An original interstellar setting. 2. They are not biologically or legally related, despite pretending to be siblings. Theme: Keep your word and honor your promises.