Recent Cambodian start-up JC INTERNATIONAL AIRLINES (QD/JJC) have started services from Cambodia to Taiwan. Currently the airline is operating a couple of ex-AIR BERLIN A320s which were delivered in March 2017.
XU-998 (msn 7224) kicked things of on 17-Apr with a service to Taichung from Siam Reap and a departure to Phnom Penh. She was back on the island again on 18-Apr with a Siam Reap/Kaohsuing/Phnom Penh service.
Meanwhile sister-ship XU-997 (msn 7474) operated a Siam Reap/Taoyuan/Phnom Penh service on the evening of 18-APR.
None of the above are daily, and presumably the next services will be a reversal (arriving from Phnom Penh and departing to Siam Reap).
With thanks to FR24 and Skyliner.