Draw Pareto Front Line in Python

Question

I have my results from multi-objective optimization problem in excel file. I use seaborn to plot my data. However, I want to plot a Pareto Front Line.

I am trying to plot my data similar to the figure this post (Is this plot a ParetoFront? and What is the best plot for Pareto Front with >=3 objectives?). Any idea, thanks?

Here is my code but it only scatter plot my data.

My code:

import seaborn as sns
import pandas as pd
import matplotlib.pyplot as plt

df = pd.read_excel('file path')
sns.scatterplot('fun1', 'fun2', data=df, hue='alpha', legend=False)
plt.xlabel('fun1', fontsize=16)
plt.ylabel('fun2', fontsize=16)
plt.show()