Supreme Casanova: Ultimate Harem System - Chapter 35: Going To The Gym.

Seven years ago, Shen Qianshu is impregnated with Ye Ling’s child in an accident.
Seven years later, the little boy becomes famous and is thought of as the nation’s son.

When he suddenly sees Ye Ling appear, he greets, “Hello, Daddy?”
Ye Ling watches as the little prince roars, “Where’s my princess?”
Just as Shen Qianshu is preparing to run with her son, she gets pushed down by Ye Ling.

“You can leave if you want, but leave me a princess first. Let’s have another baby!”

- Description from Novelupdates

At five years old, the child from the metaphysical family is about to leave the mountain, and the bigwigs of the capital city have come out to see him off.What's so great about a little dumpling?Yun Xiaoqi innocently spreads his hands, claiming he never intended to show off his powers; his simple wish is to be a good child while subtly dominating all sorts of spirits.Many oppose him during this time, and the “Little Celestial Maiden” Yun Ying teams up with various metaphysical leaders to continuously challenge him, only to be soundly beaten, losing face.Finally, the bigwigs bow down in reverence: it’s we mortals who were blind and offended the little ancestor!***The news of the little dumpling ruling over the metaphysical world reaches the Nether Realm.The Lord of the Nether Realm frowns: this milky little master must be the youngest and most temperamental special envoy from the Nether Realm.The little dumpling, carrying a lantern, walks among the mountains and rivers of the earth, guiding the souls with a proud stomp, declaring: Lord of the Netherworld is not much older than me, who are you calling childish!The noble and refined Lord of the Nether Realm lands and transforms into a twelve-year-old boy, gentle as jade: whatever the little envoy says is right.Yun Xiaoqi keeps waving his hands: nope, I'm just working here.

“After finding himself transported into a vastly different existence, a man wakes up not as a mogul or heir, but in a modest mountain life with only a younger sibling and six acres of farmland for company. Accompanying him is a miraculous farming system that transforms his simple life into an incredible adventure.Initially hesitant to accept his new role as a farmer, he soon becomes engrossed by the system’s perks. Planting seeds yields $8000, while harvesting crops brings an additional $10,000. Moreover, unique rewards make this occupation surprisingly profitable. Astonishingly, all transactions are in dollars, rapidly increasing his net worth to $10 million. Farming, unexpectedly, becomes an extraordinary endeavor.His life is peaceful, immersed in nature’s beauty and the rhythm of rural living. However, tranquility is broken when a group, including a captivated woman, discovers his farm. They are amazed by his well-tended watermelons and by him, raising questions about his serene life. What secrets does this encounter bring, and what adventures await beyond his mountain retreat?”

mc gets transmigrated to Fallout New Vegas with the merchant system. let the questionable adventure begin.