SEOUL, May 9, 2014 (AFP) - Lee sits ten-under in the OneAsia event at the par-72 Namseoul Country Club and would be taking a bigger lead into the weekend if it wasn't for a stunning 64 by compatriot Park Jun-Won.
Park is alone in second place after the lowest round of the tournament so far over the 6,943-yard (metres) course on the southern outskirts of the South Korean capital.
Kim Woo-Hyun (68) and Australian Scott Hend (66) are at seven under, while Park Sang-Hyun (66) is fifth, a shot further back.
Lee is familiar with Namseoul having played the course dozens of times while a member of the Korean national amateur team that won Gold at the Asian Games in 2010.
"It is a big advantage for me as I have played here so often," the 22-year-old said in comments released by the organisers.
"My putting has been very good, particularly from around 10 feet. These greens are very tough so you have to putt very well if you want to score here," he added.
Leading scores after round two:
(Korean unless stated otherwise)
134 - Lee Kyoung-Hoon 68-66
136 - Park Jun-Won 72-64
137 - Kim Woo-Hyun 69-68, Scott Hend (AUS) 71-66
138 - Park Sang-Hyun 72-66
139 - Park Il-Hwan 70-69, Kim Seung-Hyuk 68-71
140 - Hyun Jeong-Hyup 70-70, Hong Soon-Sang 72-68, Song Young-Han 69-71, Suk Jong-Yul 70-70, Choi Ho-Sung 68-72