The Beauty with a Child Is Always Coveted [Quick Transmigration]

[..] To fulfill his clan's birth quota, Chu Ning, the only merman of childbearing age, bonded with an otherworldly visitor called the System. The System claimed to be designed to cultivate people chosen by fate. As long as its Host completed missions in various small worlds and helped bring forth a Feng Aotian or Long Aotian, the merman clan would gain another little merman! Chu Ning, who had never left his clan's territory and was still a little merman himself, believed it. But even someone as innocent as him gradually began to realize something was off about the System. When exposed, the System burst into tears. “Waaah, I'm sorry, Host, I lied to you! I'm not some legitimate System for cultivating people chosen by fate. I'm a homeless System from Haitang City, after it was shut down!” Chu Ning: “So the missions you gave me weren't really for the good of the children...” That damn System: “It hurts me too, watching you get intimate with those people while I take the energy!” Chu Ning: “...” [Modern World] A first-time father, clumsy but gentle and attentive as he cares for his child, has no idea how many people he's attracting. The chairman visiting a remote town, the top donor in his livestream, a classmate's uncle, a high school friend reunited with him after years apart... His heart wholly devoted to his child, the father instinctively turns down the advances of others: “I already have a child.” But his refusal only makes them more excited. “Isn't that even better?” [Supernatural World] He has a child with an Extremely Yin constitution. Those with an Extremely Yin constitution are prey to every ghost. To stand against the evil spirits, he willingly offers himself as their food and enters into a ghost marriage with the Ghost King from a thousand years ago. [Xianxia World] After his half-demon nature is discovered, a disciple leaves the immortal sect. Years later, he returns with a child and kneels at the mountain gate, begging the sect to save him. Dressed in white, frail and lovely, tears falling from his eyes. To save his child, he willingly lets his former master bind him with a red cord that suppresses demons. [Ancient World] A dynasty changes hands, and a new emperor takes the throne. The incompetent former emperor falls into ruin. As the new emperor and his founding minister discuss what to do with the deposed ruler, they discover that this imperial brother, little more than a puppet, is pregnant with a child whose father is unknown. Notes: 1. A gentle, resilient beauty gong × a fragmented shou. The shou will eventually merge, and there are several fragments in each world. 2. The children have different origins in different worlds: some are adopted, some are left behind by relatives, and some are born by the gong... 3. The childbirth tag is there because the gong gives birth in some worlds. I'll give a heads-up in the author's notes. No intersex characters and no role reversal. It's fiction, so please don't get hung up on the logic! Theme: Finding a balance between family and romantic love.