Do not install
At this point I have every reason to believe there is a huge threat with rooting this way. The su binary starts a listening server and remains connected:
unix 3 [ ] STREAM CONNECTED 5629 3127/su /dev/com.mgyun.shua.su.daemon/server
unix 3 [ ] STREAM CONNECTED 11730 3118/.suv
---------- Post added at 01:55 PM ---------- Previous post was at 01:52 PM ----------
root@jfltevzw:/dev # ls -la
ls -la
---------- root root 0 1970-03-11 22:45 .coldboot_done
drwx--x--x system system 1970-03-11 22:45 .secure_storage
-rw-r--r-- root root 66560 1970-03-11 22:45 __properties__
crw-rw-r-- system radio 10, 25 1970-03-11 22:45 alarm
crw-rw---- adb adb 10, 30 1970-03-11 22:45 android_adb
crw-rw-rw- root root 10, 21 1970-03-11 22:45 ashmem
crw------- nfc nfc 10, 34 1970-03-11 22:45 bcm2079x
crw-rw-rw- root root 10, 22 1970-03-11 22:45 binder
drwxr-xr-x root root 2013-11-04 13:26 block
crw------- bluetooth bluetooth 10, 224 1970-03-11 22:45 btlock
drwxr-xr-x root root 1970-03-11 22:45 bus
crw------- root root 10, 28 1970-03-11 22:45 ccid_bulk
crw------- root root 10, 29 1970-03-11 22:45 ccid_ctrl
drwxrwx--- u0_a247 u0_a247 2013-11-04 13:26 com.mgyun.shua.su
drwxr-xr-x root root 2013-11-04 13:43 com.mgyun.shua.su.daemon
crw------- root root 5, 1 1970-03-11 22:45 console
In all fairness that could be an update daemon.