Heo Young Saeng performed "Weak Child" on this week's 'Music Bank' for the first and last time before he's scheduled to enlist in the army on the 31st.

He sang on stage with a band, wooing the crowd with his lovely and sweet voice. Fans screamed and cheered him on as he gazed emotionally into the camera or closed his eyes sweetly as he sang with passion.  

SEE ALSO: All SS501 members to stand on stage together for the first time in 3 years for Heo Young Saeng's concert

As reported before, he will be having an exclusive concert on the 26th with all SS501 members to take part as special guests.  Then, on the 31st, he will be entering the Nonsan Training Center for his mandatory two-year military service.

Check out the performance above!