Villain: I'm the Villainess's Life Mentor

(Coming-of-age) (Two heroines) (Raising your wife from childhood) (Sweet, no angst, yandere) Jiang Ze transmigrates into a fantasy novel set in a Western-style world. The original villainess has developed a problem: she has lost her rebellious personality and become gloomy, with no interest in life. The original heroine has also changed. She is no longer optimistic, but lonely and starved for affection. The System assigns Jiang Ze the identity of the world's strongest girl-training master, tasked with educating gloomy girls, helping both the villainess and the heroine return to normal, and getting the plot back on track! When dealing with the villainess, Lin Ze is harsh: “Crying is useless. Get up and keep training. Starting today, if you don't finish your training, you'll be punished with a transformation!” “Yes, teacher!” The villainess thinks, Ah~ The teacher is so fierce. I love it~ “If someone takes something from you, you must get it back by any means necessary. Understand?” “Understood!” If anyone gets close to the teacher, she'll do whatever it takes to kill them! With the heroine, Lin Ze is attentive and caring. He helps her get dressed, bathes her, washes her feet, and even keeps her company while she plays and sleeps, all to help her regain her optimistic outlook. “Teacher, will you leave me?” Lin Ze: “No, I won't.” Under his tutelage, the wicked heiress and the righteous heroine are successfully reformed, and the plot gets back on track. When it is time to leave, Lin Ze realizes that something is wrong with them! The wicked heiress wants to become a yandere disciple! Run! Yanderes are trouble! The optimistic heroine sneaks into his room at night. “Teacher, when my life was filled with darkness, you were the one who lit it up. Now that every little corner of my life is filled with your shadow, you think you can just leave so easily?” Oh no! Has the sweet, well-behaved heroine turned into a yandere too!?