Actor Suriya has confirmed he will reunite with director Hari for the fourth instalment in the "Singam" franchise, but the process will take time.Suriya's "Si3", the third instalment in the "Singam" franchise, released last week.At the success meet of "Si3", Suriya said: "Hari and I will reunite for 'Singam 4a'. It is definitely on the cards. But we might do a film before that. We will do 'Singam 4', say, after five years."Suriya popularised the character Durai Singam, a duty-fearing, uptight police officer in the "Singam" franchise.Along with the character, he also made his handlebar mustache a rage among his fans."Si3" also stars Shruti Haasan, Anushka Shetty and Thakur Anoop Singh in pivotal roles.