My Boyfriend's Sister Is Dressing up as a Woman

[The heroine's perspective] Su Li was extremely lucky after she turned 15. With average grades, she passed the high school entrance examination and entered the best high school in the city. She missed the college entrance examination and entered a key university. Her boyfriend is gentle and considerate to her, and he always takes her into consideration. Others are envious of her good fortune! The only drawback is that she has a very annoying rival, Lin Ran. Lin Ran had excellent grades and was soft on medals in various competitions. He always looked down on people like her who relied on good luck to get into good schools. The two fought from high school to college, and the worst part was that Lin Ran was actually her boyfriend's sister! - Lin Ran knew that after the two fell in love, they either became angry or poured cold water on them. Her boyfriend fed her ice cream, which made Lin Ran feel weird. Lin Ran poured cold water on her sweet date while holding hands with her boyfriend. The atmosphere was ambiguous. She and her boyfriend were about to kiss. Lin Ran stood beside her like a light bulb with hundreds of watts that was about to light up her eyes. Su Li was furious, she just wanted to have a sweet love, why was Lin Ran always making trouble! Her boyfriend was always afraid of his sister, so he coaxed her obediently: "Baby, my sister has such a cold temper. Don't be angry, don't be angry." But Su Li just couldn't bear it. She wanted to end things with Lin Ran! When she broke into Lin Ran's house, she saw Lin Ran wrapped only in a bath towel, revealing his eight-pack abs and mermaid lines. Su Li's nosebleed suddenly spurted out, her boyfriend's sister was actually a man! [Male protagonist's perspective] When Lin Ran was 15 years old, he was inexplicably bound to the system. He learned that this was a world in a book, and the male protagonist was his half-brother, who was three years younger than him. As the female supporting character, he has to lead the rebellious young male protagonist to the right path and train the male protagonist to be a good student with excellent academic performance. Only when the female protagonist appears on the stage can he retire with success. Lin Ran was shocked: He, the female supporting character in the book? But he is a man! The system is sorry: the wrong person was bound, but the program cannot be changed, otherwise both he and the system will be wiped out. As a result, Lin Ran had no choice but to disguise himself as a man and pretend to be the female supporting character in the original book to perform the mission. He disguised himself as a woman and became the male protagonist's sister, and began to provide positive ideological education to his 12-year-old brother, who was already completely rebellious! After he completed a task, he looked at his empty account and asked the system: "Didn't you say there would be a reward for completing the task?" The system is sorry: due to a binding error, the reward for each task you complete in the future will be given directly to the female partner. Lin Ran was speechless: he did the co-authoring work, and the reward was someone else's. Later, when Lin Ran saw Su Li, the female partner who didn't know anything and thought it was just his luck, he couldn't hide his resentment. Whenever Su Li felt complacent about his good luck, he couldn't help but taunt him. The two became mortal enemies. When he was a senior, he discovered that his freshman brother was actually in a relationship with Su Li. Knowing that the two of them were impossible, he repeatedly advised them to break up. Unexpectedly, the extremely angry Su Li actually broke into his room, and she discovered that he was a man... Reading Guide 1. The heroine and her ex-boyfriend are in a sibling relationship. The heroine is three years older than her ex-boyfriend. Apart from hugging, holding hands and kissing, the two have no further intimate behavior. 2. The heroine and the hero are the same age. The heroine gradually fell in love with the hero after breaking up with her boyfriend. The copy was written on March 25, 2025, revised on April 21, 2025, and screenshots have been retained. Purpose: Love yourself every day