To Evaluate the Safety, Tolerability, Pharmacokinetics and Antitumor Activity of YYB101 With Irinotecan, Patients Who Are Metastatic or Recurrent Colorectal Cancer Patients

"1. b (Dose level 0 cohort): YYB101 20mg/kg, Irinotecan 150 mg/m2 of each dose level, IV infusion on Day 1, Day15, and followed by every 2 weeks until disease progression or unacceptable toxicity~2. a Stage 1: YYB101 RP2D, Irinotecan 150 mg/m2 of each dose level, IV infusion on Day 1, Day15, and followed by every 2 weeks until disease progression or unacceptable toxicity"