Bogor, Indonesia: Korea Republic booked their place in the AFC U-19 Championship Indonesia 2018 final on Thursday with an impressive 3-1 win over Qatar at the Pakansari Stadium in Bogor.   The Koreans will now face Saudi Arabia - who defeated Japan 2-0 in the other semi-final - in Sunday’s title showdown, leaving Qatar to reflect on what could have been at the end of a campaign which saw them - along with the other three semi-finalists - qualify for next year’s FIFA U-20 World Cup in Poland.   In damp conditions, the game began brightly but without a genuine threat on goal until Khaled Mohammed drove a shot from distance into the welcoming arms of Korea Republic goalkeeper Lee Gwang-yeon on 16 minutes.   Korea Republic’s response, when it came, was decisive, an unmarked Jeon tapping home Um Won-sang’s 23rd minute cross from close-range after lax Qatari defending from a throw-in.   With central defenders Lee Jae-ik and Kim Hyun-woo nullifying the threat of tournament leading goalscorer Abdulrasheed Umaru, Korea Republic duly doubled their lead shortly after the half-hour mark.   Yet again, it was the outstanding Jeon who starred, this time the midfielder bending a delightful - albeit deflected - free-kick past Qatar custodian Shehab Mamdouh to notch his fifth goal of the competition.   On the stroke of half-time, two became three for the rampant Koreans as Um Won-Sang lashed captain Hwang Tae-hyeon’s pinpoint delivery past Mamdouh to round off an excellent first 45 minutes for the East Asians.   To their credit, Qatar refused to buckle after the break and they gave themselves a lifeline on 52 minutes when Lee Jae-ik turned substitute Abdulla Almurisi’s drilled cross into his own net.   Umaru then flashed a shot narrowly wide of the far post, before Jeon’s sublime cross was expertly headed to safety by Youssef Ayman as Um threatened to pounce in the 67th minute.   Despite their persistence and the best efforts of striker Umaru, Qatar, minus the red-carded Nasser Abdulsalam, struggled to make any further inroads, and it was to be Korea Republic who came closest to rounding off the scoring through Lee Kyu-hyuk’s late free-kick which Mamdouh did well to repel.