A comprehensive study of the planetary nebula K4-55 is presented. In addition to CCD narrowband images, spatially resolved low-dispersion and high-resolution spectra were obtained. This has allowed the different morphological features in the images to be connected with the kinematics and with the physical information, leading to the establishment of the complex nebular structure. K4-55 is a new multiple-shell planetary nebula displaying three different parts: a faint halo that extends up to 2' from the main nebula; an outer part revealed by the kinematical study as a pole-on bipolar structure; and an inner, bright ring. The bipolar structure is expanding at ˜100 km s-1 at the poles, while the halo has Vexp ≲ 8.6 km s-1. The inner ring exhibits intriguing kinematics, indicating a likely presence of rotation. Abundance variations are found throughout the nebula, with a N/O abundance ratio enhancement in the [N II]-bright central ring, whereas the extended halo presents a much smaller ratio. The N/O ratio reported is among the highest ever found in planetary nebulae. The outer halo is consistent with the asymptotic giant branch wind, whereas the inner nebula was formed during a later mass-loss phase.