- “All those years ago, I made you a promise that I would help you become a sea.
Guyiding Tri-Rain, are you willing to become… the Ninth Sea of the Mountain and Sea Realm?„
- — Meng Hao fulfilling him promise
on Chapter 1557: I Bestow Upon You the Title of Ninth Sea!
Guyiding Tri'rain is one of the recurring characters of I Shall Seal the Heavens.
She appears as a girl about seven to eight years of age, with her hair tied up in twin pigtails.
Originally a lake bellow Mount Daqing that eventually gained a spirit. This spirit of a lake had a dream to become a sea.
Meng Hao gained enlightenment in the North Sea regarding the "Dao", something that only Dao-Seeking experts do, while he was in the Qi Condensation stage. Guyiding Tri'rain gave Meng Hao as second life by saving him from the claws of death when he was being pursued by Ding Xin. In return, Meng Hao promised to fulfill her greatest ambition i.e become an actual Sea.
Later, Meng Hao met her in the Milky Way Sea in the "State of Xiao" where she and the boat spirit helped him escape from the 10th Wang Clan Patriarch.
After the Ninth Sea disobeyed Meng Hao's orders, he decided that he would remove the spirit of the Ninth Sea and replace it with Guyiding Tri'rain.
Later, when Meng Hao reminded her of his promise to make her a sea, she responded that she had already become a sea. It is unknown what she meant by that, as she clearly wasn't the spirit of a sea yet.
While Meng Hao was recreating the New Mountain and Sea Realm when he was creating the Ninth Mountain and Sea there was no Ninth Sea as the previous Ninth Sea turned traitor. Meng Hao fulfilling his promise, he made Guyiding Tri-Rain the new Ninth Sea. 
- Her lifelong dream is to become a sea. This was later fulfilled by Meng Hao when he made her the Ninth Sea of the reformed Mountain and Sea Realm. 
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