Appearing via phone call on the latest episode of KBS's 'Mamma Mia',�'nice guy' Song Joong Ki revealed that he still didn't let most other celebrities into his private life despite his growing popularity.

Hosts Lee Young Ja and Super Junior's Kyuhyun�asked him what his mother's reactions were when he invited friends over to his house. "Even after I debuted, she treats them well and makes them good things to eat," he responded.

However, he didn't have much of a sample to go on. "Lee Kwang Soo was the only one who's been to my house," he confessed.

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Picking up this tidbit of information, Kyuhyun suddenly asked, "Can I be the second one to �visit your house?" to which Song Joong Ki agreed gladly.