import matplotlib.pyplot as plt

months = ["1월", "2월", "3월", "4월", "5월"]
sales = [120, 150, 90, 200, 170]

plt.rcParams["axes.unicode_minus"] = False
plt.plot(months, sales, marker="o")
plt.title("Monthly Sales")
plt.xlabel("Month")
plt.ylabel("Sales")
plt.show()