One big difference between Asian celebrities and western celebrities is what is viewed as a scandal. Here in the west, no one thinks twice about celebrities dating. It can be juicy gossip but not career damaging. In Korea and other Asian countries, idols are seen as untouchable and are put on a pedastal. If they do date, it has to be approved by their agency and the partner must be on the same level as them. It still will most likely cause public uproar because no one wants to see thier idol attached to another. Plus, they are supposed to be seen as perfect and pure, especially female idols. One little scandal, even something minor, can ruin a career.
