I can understand most of the Japanese parts. He basically comes out and the MC first compliments him by saying he is so handsome, cool, and stylish (kakkoii) with his white shirt with the design on the sleeves, and his black pants and shoes with no socks. The MC then remarks that although he has been recently acting in dramas he is part of the idol group Ze:a and performs dances with the group. Since he is there they want him to dance to some Ze:a songs. At first he replies that it's very different dancing alone than dancing with the group. The MC jokingly remarks that since he is the only one there that day, it can't be helped. They prepared a series of song clips of Ze:a songs that they wanted him to dance to and see how well he can dance to them, but they say that he hasn't rehearsed at all and he has no idea what songs they will play. He looks very surprised and nervous and I think a little upset that they sprang this on him, but he good naturedly said he would give it a try (I think he did great-that smile of his!) At the end when he finished, the MC mentioned how great/amazing (sugoi) he was and he did a pretty close to perfect job and he remembered the choreography pretty well.
Then at the very end he must have said something about how he felt lonely performing by himself. Then when he was drinking the bottled water they said he was so cute/cool as he was drinking his water.