Here in the USA, this switching configuration is oftentimes found in older farmhouses with an outbuilding with receptacles constant hot, a yardlight in between, and a pair of 3 way switches controlling the yardlight from the house and outbuilding, using 3 wires instead of 4, not counting the ground. Banned by the NEC in 1923 but installed as recently as the 1960s, even '70s because it saves a wire. There are 4 possible switch positions. N-N = light off H-N = light on. H-H = light off & socket remains energized. N-H = light on & reversed polarity.

Thought the neutral goes direct to the light

Sir parang mas mahirap yung diagram mo..pwd nmn yung live lng yung gagalaw jan dba

Paki check ng diagram, mali ang pagkaguhit, bakit pumasok sa magkabilang switch ang both lines, the hot line (live wire) and the ground line (neutral line) puputok po iyan, magsasalubong ang linya ang isang linya, ground line ay diretso sa ilaw at yung isa, the hot line ay sa 0 ng 3-way switch at yung 0 ng other 3-way switch ay papunta sa linya ng receptacle, to connect sa may fillament ng ilaw, at alam naman natin na yung 1 at 3 ay traveller