Okkkk so this is my lil theory about the mv: #Taeyeon_SomethingNew

The hotel represents the entertainment industry and she had been aiming for the top since she started her career
The B&W and dark themes represent things the public can't see. The comparison have 2 interpretations: how she feels vs what we see OR early days when it felt like no one supported her vs now that she's successful
The security guard:

The guard may be a reflection of toxic people around her at work- people who are supposed to help her but secretly try to sabotage her career. Note the guard was reaching for this pocket, perhaps for a weapon, before she took out a hammer to defend herself
The hotel staff:

She came in unexpectedly to gain Taeyeon's trust but has the intention to destroy her. She could be an illustration of other people in the industry who try to eliminate her by betraying her.

Ps: her appearance shows resemblance w/ the assassin in the Kingsman
She was enticed by the benefits these people provide so she couldn't leave. In the end, she fell into the trap and felt betrayed. This and the previous fight scene are both B&W to show that the public don't see her struggles and assume she "got everything on a silver platter"
Suitcases:

Since the "dead bodies" are inside the suitcases, we can assume the suitcases symbolise secrets and burdens. Leaving the hotel after bombing it may indicate after leaving a great impact in the industry, she is now becoming a veteran idol and no longer wants to compete
After stepping out of the industry, she is abandoning her burdens. What was supposed to be dead bodies turned into money to show that the people who tried to destroy her life ended up making her rich. Yet, she just wanted to leave everything behind and run away
The media and the public now think she is living a happy life but this is not entirely the truth. Only Taeyeon herself knows her own sorrow and still suffers from stress and sadness.

So thats it. I don't know if it is an accurate interpretation but feel free to discuss!
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