Route trace from Beijing Unicom Residential network, looks like packets are routed through japan, not sure if it's just temporary or will be improved later. (Comparing 50+ms from Beijing to other providers in Korea):

  3     5 ms     6 ms     3 ms  61.148.160.169
  4     8 ms     7 ms     6 ms  124.65.57.117
  5     6 ms     7 ms     6 ms  123.126.0.77
  6    36 ms    38 ms    39 ms  219.158.7.22
  7   109 ms   103 ms   105 ms  219.158.23.10
  8    42 ms    39 ms    41 ms  219.158.19.81
  9   165 ms   165 ms   163 ms  219.158.33.22
 10    89 ms    88 ms    87 ms  106.187.6.173
 11   164 ms   165 ms   168 ms  118.155.197.178
 12   177 ms   177 ms   177 ms  106.187.28.90
 13    94 ms    97 ms   100 ms  27.0.0.228
 14     *        *        *     Request timed out.
 15   179 ms   182 ms   180 ms  54.239.123.136
 16    95 ms    94 ms    93 ms  54.239.123.125
 17    98 ms   133 ms   102 ms  54.239.122.226
 18   161 ms   152 ms   143 ms  54.239.122.241
 19   101 ms   102 ms    99 ms  54.239.122.6
 20     *        *        *     Request timed out.
 21     *        *        *     Request timed out.
 22     *        *        *     Request timed out.
 23   100 ms    99 ms   100 ms  my.vps.ip.addr

* edit: removed my instance ip.