The helplessness of life

There are always so many people struggling in life, maybe everyone is like this, what should we do when our kindness faces the shamelessness of others?
A few questions, I hope you can enlighten me:
1 What does the layout of Pei Doona's room indicate, what are the photos on the photo board, what does the police model mean, and the above... flies?
2 I really like Pei Doona, but What does the sex scene show? I really don't understand, because you are like an ant? Interpretation of Love or What
3 Did Bae Doo Na confess to Shin Ha Kyun when he was electrocuted? The version I saw translated was Pu Jie,
4 Was the painting painted by that person? The person who robbed the little girl's necklace was Shen Hua.
5. The real identities of the last four people?
Swim to North Korea to meet Kim Jong Il Smecta

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