Tsui Ka Ho (Chinese: ???), born 30 September 1980, more known by his pen name Lam Yat-hei (Chinese: ???) or Roy Tsui, is a Hong Kong lyricist, who has written over 80 pieces of lyrics since 2007.
He is also a writer and the founder of Blackpaper Limited (Chinese: ??????).
Blackpaper Limited is a local publisher which engages in multimedia creation and advertising campaigns.
Multiple business and media channels owned by Tsui under Blackpaper Limited including Whitepaper Publishing (Chinese: ?????), periodical magazine Blackpaper (Chinese: ??), satirical weekly magazine 100 Most (Chinese: 100?) and multimedia platform TV most (Chinese: ????).Tusi has also been writing columns for several papers like the Mingpao Weekly and the Oriental Daily News.