Sure, here is a budget-friendly travel plan for Barcelona for travelers from Southeast Asia:

**Accommodation:**

* **Hostel One Paralelo:** This budget-friendly hostel offers dorm beds for as low as €20 per night. It is centrally located and has a social atmosphere.
* **Generator Barcelona:** This hostel is also centrally located and offers a variety of room types, including dorms, private rooms, and family rooms. Prices start at €25 per night for a dorm bed.

**Food:**

* **La Boqueria Market:** This market is a great place to find fresh produce, seafood, and prepared foods at affordable prices. You can also find a variety of restaurants and tapas bars inside the market.
* **El Born:** This district is home to many affordable restaurants and tapas bars. You can find a good meal for around €10-15 per person.
* **Street food:** Barcelona has a great street food scene. You can find everything from tapas to kebabs to churros for around €5 or less per person.

**Transportation:**

* **Purchase a T-10 ticket:** This ticket gives you 10 rides on public transportation for €11.35.
* **Walk or bike:** Barcelona is a very walkable city and there are also many bike rental shops. This is a great way to save money on transportation and get some exercise at the same time.

**Activities:**

* **Free walking tour:** There are many free walking tours available in Barcelona. This is a great way to learn about the city's history and culture without spending any money.
* **Park Güell:** This park is one of Gaudí's most iconic creations and it is free to visit.
* **La Rambla:** This famous pedestrian street is a great place to people-watch and soak up the atmosphere of Barcelona.
* **Picasso Museum:** This museum offers free admission on the first Sunday of every month.

**Sample itinerary:**

**Day 1:**

* Morning: Arrive in Barcelona and check into your hostel.
* Afternoon: Take a free walking tour of the city center.
* Evening: Have dinner at one of the many affordable tapas bars in the El Born district.

**Day 2:**

* Morning: Visit Park Güell.
* Afternoon: Take a walk down La Rambla.
* Evening: See a flamenco show in the Barri Gòtic.

**Day 3:**

* Morning: Visit the Picasso Museum on the first Sunday of the month.
* Afternoon: Explore the Gothic Quarter.
* Evening: Have dinner at one of the many street food stalls in the La Boqueria Market.

**Day 4:**

* Morning: Take a day trip to Montserrat.
* Afternoon: Visit the Camp Nou stadium.
* Evening: Have dinner at one of the many affordable restaurants in the Barceloneta district.

**Day 5:**

* Morning: Take a cooking class and learn how to make some of your favorite Catalan dishes.
* Afternoon: Depart from Barcelona.

This is just a suggested itinerary, and you can customize it to fit your interests and budget. For example, if you're interested in art, you could spend more time visiting museums. If you're on a tight budget, you could eat more street food and take advantage of free activities.

No matter what you choose to do, you're sure to have a wonderful time in Barcelona. It's a vibrant city with something to offer everyone.
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