Chinese President Xi Jinping told a South Korean envoy today he was willing to put relations back on a "normal track" amid tensions over a US anti-missile system deployed on the Korean peninsula.
"Your visit to China to step up the communication on important issues related to bilateral relations... Shows President Moon and his administration have attached high importance to our ties," Xi said.
For his part, Lee said Moon asked him to express his "gratitude" to Xi for his message of congratulations after the election.
Ties between the two countries have soured in recent months over the deployment of the powerful Terminal High Altitude Area Defence (THAAD) shield in South Korea, which Beijing sees as a threat to its own military capability.
Left-leaning Moon and Xi spoke on the phone last week and both agreed that denuclearising the North was a "common goal" between them, Moon's spokesman said.
Tensions have been running high in the region, with Pyongyang launching what appeared to be its longest-range missile yet on Sunday.
The United Nations Security Council met behind closed doors on Tuesday to discuss tightening sanctions on North Korea.
Xi's conciliatory tone came a day after Chinese Foreign Minister Wang Yi told Lee that Seoul must "remove the obstacles that have been placed on the road to good relations between our two countries".