Secret of the Heart is a 1998 TVB production that was first aired from February 16,1998 to May 10, 1998. The drama had a powerful roster that is made up of Gallen Lo, Felix Wong, Amy Kwok, Kathy Chow, Sunny Chan, Ada Choi, Jessica Hsuan and Nick Cheung. It won three TVB Anniversary Awards, including Best Actor for Gallen Lo, Best Actress for Ada Choi and Best On-Screen Improvement Award for Nick Cheung.

The drama also received a late night hour rerun during 2003 and 2010. It was digitally remastered for the 2010 rerun.

故事发生在清朝，又一批新的秀女从地方推荐到京城参加选举了，其中包括湖广总督的女儿侯佳玉莹（黎姿 饰）、出身上三旗的尔淳（佘诗曼 饰）等名门望族的女儿。岂料，半路运送这些秀女的官车遭到山贼打劫，官兵都被山贼杀害，眼看这些秀女就要落入山贼手中。这时，运送贡品香芒上京的孔武（陈豪 饰）和陈爽路过，将秀女救下。随后，他们历尽艰苦躲过追杀，终于将秀女安全护送到京。
侯佳玉莹和尔淳在逃亡时结为金兰，其实两人暗里却各有所谋，尔淳和她的两个姊妹将玉莹视为最大劲敌，千方百计排挤她，让她吃尽苦头；玉莹表面上处于下锋，楚楚可怜，却内心通透，自有手段。二人设法博取皇上欢心，而尔淳也在纷争中尽力掩埋着自己背后的秘密，岂料，太医孙白杨（林保怡 饰）的出现，却令玉莹和尔淳的计划都横生了枝节，后宫斗争进一步变得步步凶险。