The main objective is to evaluate the safety/tolerability and efficacy of YHD001 compared to
singulair or placebo in patients (n=96) with partially controlled asthma.
The study will conduct with 4 comparative groups orally treated with YHD001 dose level
1(t.i.d.), YHD001 dose level 2(t.i.d.), singulair 10mg(q.d.) or Placebo for 8 weeks.