Habitat of Mountains and Seas

[Two female protagonists + two male protagonists with sub-CP] Qi Wan's mother was married for the second time and fell in love with Song Yan, a big boss in the business circle. Qi Wan's father was an alcoholic. He only drank all day and night. When he was drunk, he would only take out his anger on her mother and daughter. Qi Wan's mother got divorced in anger and remarried with her daughter. Song Yan took mother and daughter back to the Song family and arranged a room for Qi Wan, right next to Song Yu. "Hello sister, my name is Qi Wan" "Sister, what's your name?" "Song Yu" Qi Wan said in his heart, "My sister's name is nice and she is good-looking." … "It turns out love is gender-neutral" "Secret love can also be aboveboard." "I am a mountain and sea without a destination, and you are my best habitat." "Awan, I really like you very much." "Ayu, we should never be separated."