Nabi

You are reading Nabi manga, one of the most popular manga covering in Action, Drama, Historical, Manhwa, Romance, Shoujo genres, written by Kim yeon-joo at KaliScan, a top manga site to offering for read manga online free. Nabi has 56 translated chapters and translations of other chapters are in progress. Lets enjoy.
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From JanimeS:

The series begins as a guest visits a temple where Myo-Un and Ryu-Sang are living along with many other orphan children. This guest turns out to be an assassin who came to kill a certain someone who is the last child of a powerful family in Su country. The assassin's employer, who remains anonymous, wants to clean up every root of possible problems.

The assassin calls for reinforcements and attacks the lady of the temple, revealing that the lady of the temple is also another last descendent of another powerful family that was drawn out of Su country. Myo-Un, Ryu-Sang, and others are forced to flee the temple.

Thus, Myo-Un & Ryu-Sang's journey begins, and the assassin is still after them.