Liam visits his Grandpa’s grave to say goodbye but finds cryptic coordinates engraved on the tombstone. His family is moving after his father’s gambling losses, and Liam feels crushed, saying, “I’ll never be able to achieve my dream… It’s over!” While clearing moss from the tombstone, he discovers coordinates leading to a railway station cloakroom.

Liam follows the trail to the station and, with the help of the receptionist, locates a locker registered to his Grandpa. Though unsure how to unlock it, Liam suddenly remembers the number 1717—his first toy airplane model, made with Grandpa.

Inside, Liam finds $150,000 and a diary from his Grandpa. The note reads, “Dear Liam, if you’re reading this, you’re a wonderful grandson… I hope you haven’t abandoned your dream of becoming a flight engineer.”

The diary reveals Grandpa’s love story and warns Liam about his father’s past mistakes. Now, with the money and knowledge, Liam holds the final chance to fulfill his dream, just as his Grandpa had hoped.