Well, that's very difficult question. HAHAHA. I think the best way to build a closer relationship with someone depends on his or her personality. But the basic thing is that you have to spend a lot of time with him or her. Assuming that you spend a lot of time, the method can very depending on the person's personality. If the person is a bright and outgoing personality, he or she can build closer relationships by having many conversations and doing many activities. On the contrary, if the person has a shy and introverted personality, he or she should give him or her time to adjust to the situation and make sure he or she can get to know each other slowly. Otherwise, a person with a shy and introverted personality can easily feel burdened.