Transmigrating: Who's the Baby's Father?

After transmigrating, when he opened his eyes again, he had become Field. All right, even if he had turned into a delicate, slender, frail young man, he was willing to accept it if it meant getting a second chance at life. But before he had even figured out where he was, someone told him he had a baby!? Can't speak the language? He could learn! Don't know magic? He could practice!! Bad treatment... he could endure it!!! But could someone please tell him where this child came from?! Child, don't ask who your father is. Because I haven't even met your cheap, troublesome dad... This novel is also known as “An Extraordinary Journey: Phoebe's Story.” Literary-style blurb: In his previous life, he had summed up everything he learned with one sentence: There is no such thing as fairness in this world. If you want to live freely, you have to be strong. So when he transmigrated into the body of a prisoner named Field, he was left with just one thought: become stronger. Field: I've always wanted to become stronger. At first, it was for myself. Later, it was for my innocent child, then for Amber, who gave up everything because of me, and finally for you, walking alone through life. Simon: With the Lord God as my witness, I, Simon, make this eternal vow: my body belongs to this country, but my soul belongs only to Phoebe. Even when my life ends, my soul will protect him forever, until the next life, and the one after that, for all eternity. This is a story about a seemingly weak but self-reliant protagonist who gives birth to a child with a silent, expressionless love interest, then meets and falls in love with him. ~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆~★~☆ A few things to know before reading: 1. This story continues the author's peculiar tastes: it is another male pregnancy story, but the birth plot ends within the first three chapters. Readers, please proceed with caution. If this isn't for you, please turn back. 2. The story centers on the receiving partner. The pairing is set, one-on-one, with a happy ending. The plot is clichéd and melodramatic, and the characters are extremely idealized, so bring your anti-cliché gear. Theme: Your fate is in your own hands.