Bolton are currently being down in 15th place, 10 points adrift of the top six, ahead of Tuesday's clash at home to Peterborough (kick-off 8pm).
The Korean winger told the Bolton News: "There is not a big gap to the top six, so I think we still have time to do it.
"It is great to have all our players back like Stuart Holden and David Wheater. We have a stronger squad now and that means we can play at our top level."
Bolton are unbeaten in their last four league games and will be boosted by Saturday's 4-1 win over promotion-chasing Hull at the Reebok Stadium.
Peterborough are still rock bottom of the standings despite claiming seven points from their last four games.