Jin, a teenager, used to go online after school. He ate dinner with his family, did homework, and got a good night's sleep. One day he got involved in an online game. He didn't stop playing to have dinner. He didn't do his homework.His focus all night was only on the virtual reality in the game. The next day, in the real world, he did poorly on a test. His parents took away his computer for a week. Jin became very angry. He refused to leave his room, and he refused to attend school. Jin's once-normal Internet use was now an addiction.