After training in Taiwan for one year, Sit made her debut Mandarin album "It's My Day" which was released on 18 April 2008. The album was recorded in Taiwan and in Singapore. It features songs such as "I don't need Tiffany", which refers to the jewelry company and a duet with Khalil Fong, "Overcoming Memories". "It's My Day" was the first plugged song in Taiwan while "Alice's first Time" was the first plugged song in Hong Kong. This Mandarin album made Sit the best five sellers in the year in Hong Kong and became famous in Taiwan.