SINGAPORE -- A Singaporean businessman is offering a 3 million yen reward to find his only son, who failed to return from a hiking trip to Mount Fuji.

Koh Wei Ping, 21, a student at the Tokyo Institute of Technology, disappeared after he went to Lake Kawaguchi during a school break last October. His father, Koh Kia Swee, is offering the reward to anyone with information leading to his safe return.

Wei Ping had just finished a one-year Japanese-language course at the University of Osaka and was waiting to start undergraduate studies in electronic and electrical engineering. He was staying at Kawaguchi Youth Hostel and was last seen setting off for a day hike with a British tourist from the same hostel. The Briton said he turned back halfway because the trek was too difficult. Wei Ping left a note for his roommate at the university, saying he would be back Oct. 28.