REJECTED ONCE, FROZEN FOREVER - Chapter 19: WELCOME TO THE FAMILY

The scum’s or villain’s long road of transformation was tentatively set to the world:
The abandonment of the educated youth’s wife (Completed)
The hidden marriage of the scum film emperor (Completed)
The best brother in the world (Completed)
The Phoenix male who destroy the bridge after crossing the river (Completed)
The treasonous general (Completed)
I’m an honest man (Completed)
To become the top scorer in the School of Agriculture (Completed)
The soft rice man’s self-cultivation (Completed)
The whole world is reborn (Completed)
I want to survive on a desert island (Completed)
The stallion male who has seized the opportunity (Completed)
The perverted self-salvation (Completed)
The spring of the loafer (Completed)
The misplaced life (Completed)
The miser career (Completed)
The ghost is out of feeling (Completed)
The Queen’s favorite husband (Completed)
The vicious girl with her godfather (Completed)
I want to be a good person (Completed)
I does not tear up the family (Completed)
The perverted common plant (Completed)
The Mary Sue’s men (Completed)
Every time I was reborn, someone wants to kill me (Completed)
The old people’s counterattack path (Completed)
The global evolution (Completed)
When I became a net red (Completed)
For you, good person (Completed)
His heart had white moonlight (Completed)

- Description from Novelupdates

Perla had always felt a longing for adventure, stifled by the rules of her strict upbringing and surrounded by her older brothers free to do as they wanted. She longed to carve her own path, to seek out excitement and perhaps even a little romance along the way. One day, while escaping yet another tedious piano class, she stumbled into the hollow of a massive tree. At its base, a mesmerizing green light beckoned her, and before she knew it, she was transported to a bizarre forest teeming with colossal, long-extinct creatures and menacing carnivorous plants.This was the realm of Beastkin, where men could transform into mighty beasts. Here, the constant threat of war had led to a peculiar imbalance, with most females giving birth to male Beastkin, resulting in a dire shortage of women. The land was a battleground, filled with mercenaries and adventurers seeking glory. While the males formed companies to embark on quests, their females stayed behind, living a life of comfort. But not Perla—she was determined to break free from the mold, to grow stronger, and to join her new love interests on exhilarating escapades.

Kusumi Chiharu gets a message one day that he has been selected as a Monster Tamer, and he is prompted to select his first partner. He thinks little of the message until he receives a giant package the following day. He assumes it’s the porn books he ordered, but the huge box ends up containing the unconscious body of a near-naked girl! She’s a ghoul named Zonmi, who intends to fight beside him as his partner.

However, it turns out that other hot girls at his mostly-male high school are also magical entities, and Zonmi may not be the only one who wants to fight by his side!