MAURITIUS, 15 May 2016, (AFP) - The 20-year-old took the Trophee Hassan II title last week in Morocco, and could now move into the top 70 in the world rankings having been 133rd a fortnight ago.
He carded an even-par final round of 72 at the Four Seasons Golf Club, with a birdie at the 18th sealing a thrilling victory on a six-under-par total of 282.
Wang is the first man to win back-to-back European Tour events since Rory McIlroy at the Bridgestone Invitational and USPGA Championship in 2014.
He is also the third-youngest player to win his first two tournaments on the tour in the same season, with only Spaniards Sergio Garcia and Jose Maria Olazabal managing the feat at a younger age.
"I hope I can win three in a row, but next week is a really big tournament and it's my first time in Ireland, so I'm not sure," Wang told www.europeantour.com, referring to next week's Irish Open at the K Club.
"I probably had luck on my side today. I wasn't even thinking about winning this week until the 16th. I missed a lot of putts so I thought I didn't have any chance to win."
Wang started the day one stroke behind playing partner Rahman of Bangladesh, and slipped further adrift with a bogey at the opening hole.
Rahman briefly pulled four clear, and took a three-shot advantage into the final three holes.
But the 31-year-old buckled under the pressure of trying to win his first title on one of the two major tours, double bogeying the 16th and taking a four on the par-three penultimate hole.
The duo were locked at five under going up the par-five last and Wang superbly got up and down from the greenside bunker for birdie, before Rahman saw his chip to force a play-off hit the pin.
Leading final round scores in the EPGA and Asia Tour Mauritius Open on Sunday (Gbr & Irl unless stated, par 72):
282 - Jeunghun Wang (KOR) 69 70 71 72
283 - Siddikur Rahman (BAN) 68 72 69 74
288 - Estanislao Goya (ARG) 69 79 69 71, Nicolas Colsaerts (BEL) 75 65 73 75
289 - Andrew Dodt (AUS) 66 70 77 76
290 - Brandon Stone (RSA) 73 75 68 74
291 - Ross McGowan 75 67 78 71, Rahil Gangjee (IND) 73 76 71 71, Terry Pilkadaris (AUS) 74 72 73 72, Jason Scrivener (AUS) 71 77 71 72, Richard McEvoy 71 74 73 73
292 - Edoardo Molinari (ITA) 72 72 78 70, Jaco Van Zyl (RSA) 71 72 78 70, Ryan Evans 71 73 75 73, Jyoti Randhawa (IND) 73 75 71 73, Masahiro Kawamura (JPN) 72 72 74 74, Scott Hend (AUS) 72 74 69 77
293 - Keith Horne (RSA) 73 74 75 71, Scott Vincent (ZIM) 74 71 76 72, Stuart Manley 71 76 74 72, Ulrich Van Den Berg (RSA) 73 73 75 72, Adilson Da Silva (BRA) 74 73 72 74, Natipong Srithong (THA) 70 76 73 74, Miguel Tabuena (PHL) 77 71 71 74, Adrian Otaegui (ESP) 77 71 71 74, Oliver Bekker (RSA) 75 69 73 76