For those who are wondering what Mark was wearing around his neck in Japan Expo Thailand 2020 yesterday, it was a personal air purifier since he can't wear a mask. He was also asked if Mayom Chit (the fruit him and Kim bought last Saturday) is delicious. He said it was
4 Huajai Haeng Koon Kao (4 Hearts of the Mountains) siblings reunion and sang the OST "Hai Ruk Dern Tahng Mah Jur Gun" (ให้รักเดินทางมาเจอกัน).
Their names are the four elements. Mark was Din (Earth), Kim was Nam (Water), Boy Pakorn was Lom (Wind) and Nadech was Fai (Fire).
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