Feng Feifei's "I love you in my heart" is actually a cover of the English song "More Than I Can Say". This song was written by Jerry Allison and Sonny Curtis in the early 1950s, and was sung by BOBBY VEE at 196 1, and then by the British male singer (LEO SAYER).
The mandarin version of I Love You in My Heart was originally sung by Taiwan Province singer Feng Feifei (198 1 year).