Dharun was born on 31 December 1996 in a village called Ravuthampalayam[2] near Avinashi in Tiruppur district.

Dharun's mother is a school teacher while his sister Sathya plays volleyball for Tamil Nadu.

The quartet of Dharun, Mohammad Anas, Kunhu Muhammed and Arokia Rajiv clocked 3:00:91, rewriting the national record of 3:02.17 set by themselves four weeks earlier in Turkey.

In August 2018, Dharun won the 400 meter hurdles silver medal at the Asian Games in Jakarta with a timing of 48.96 seconds setting a new national record.

[9][10] In Sr Federation cup 2019, Dharun broke his own National record for the 3rd time in 400m hurdles by clocking 48.80sec .