[1] His father had a 30-year career in the film industry, starting as a Production Manager under A.L.S.Srinivasan and later working as an Assistant to MGR, ultimately rising to the role of an Executive Producer.
[1][4] Whilst looking for a better job, he was recommended by his old neighbour, Script Writer, S. Ramana Girivasan, to work as an Artist Coordinator in the show Athu Ithu Ethu on Vijay Television.
[6] Apart from his on-screen roles, Karthik has also rendered his voice for Vetri, his co-actor in K5, in the short film 'Yaanum Neeyum' released in 2015 for Naalaiya Iyakkunar Season 5.
In 2017, Karthik essayed the lead role of 'Adhitya' in Zee Tamil's daily soap Sembaruthi, alongside newcomer Shabana Shahjahan.
This preparation, which included gaining weight and growing a longer beard - a change in appearance that drew criticism from the audience who were accustomed to his characterisation of 'Adhitya' - involved a demanding 34-day shoot conducted concurrently with his commitments to Sembaruthi.
[18] Following a two-year hiatus, Karthik resumed his television career in 2022, portraying 'Karthikeyan' in the Zee Tamil serial, Karthikai Deepam, reuniting with his 'Black 'n' White' co-star, Arthika.